 html,body{
                width:100%;
                height:100%;
                padding:0;
                margin:0;
                overflow: hidden;
            }
            body{
                background-size: 100% 100%;
            }
            #rigster{
                margin:8em auto;
            }
            #rigster #rigster_head{
                margin-bottom: 2em;
            }
            a{
                cursor: pointer;
            }